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NOTE
The transistor circuit solution is not suitable for applications with baud rates exceeding 460Kbps.
3.8. (U)SIM Interface
The (U)SIM interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and 3.0V
(U)SIM cards are supported.
Table 14: Pin Definition of the (U)SIM Card Interface
Pin Name
Pin No.
USIM_DET
17
USIM_VDD
21
USIM_DATA
18
USIM_CLK
22
USIM_RST
16
UG89 supports (U)SIM card hot-plug via the USIM_DET pin. The function supports low-level and high-
level detections. By default, it is disabled and can be configured via AT+QSIMDET. Please refer to
document [2] for details about the command.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
UG89_Hardware_Design
I/O
Description
DI
(U)SIM card hot-plug detect
PO
Power supply for (U)SIM card
IO
(U)SIM card data
DO
(U)SIM card clock
DO
(U)SIM card reset
UMTS/HSPA+ Module Series
UG89 Hardware Design
Comment
1.8V power domain.
If unused, keep it open.
Either 1.8V or 3.0V (U)SIM card is
supported and can be identified
automatically by the module.
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